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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c585a7b4bebc875cb83177a0c08868019114eb0178c7332b9a47d9f63119b3' 
  AND token = '1kWJz9TsPB68hOBIrBdJfLKdJ8LZ4yni6NgaqJ0cZAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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