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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994bf5dd6bcd50a1165d8f1f5f000139e7984e0b05eef7dc664809fbb3aef7f1' 
  AND token = 'DEJmjLGFZFWtzoT6HdKAEbIEYpRa0llvEIcsGfm0d+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}