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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10bc17fef040ab6f9ead97e70ab604786b0e3a1f2c4e6c37c524aacc0208871a' 
  AND token = '6gUZL3OCrUybqg9pjTU1cODfTYDcvc7Xx3yYgSeyZ6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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