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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36dba808c9e4eaa308a4c896fdce7a4ecb5bd414db51d521b65d35e41136fa45' 
  AND token = 'kN5bc/wg1L5jMx0sikVmRdBzgm2ZW5yWCcUOKzGd0oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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