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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ea8a5a93a94abe9dd6712950aa2f191e3e35d9d99fc5fb80e6ca3e9353fd4d' 
  AND token = 'TViW3yGubh2vgSgQcc3TQBsCQg8Fg9anW1KnxnU0KWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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