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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88ed13bb2c6e3366f6776ac8cb4fef16d02e14808ff01430ea3451c118d812f' 
  AND token = 'eRn0dZBskprktP6B6UqTpCJtv4+a6ORDBBlDpUPEnag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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