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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464bc565cd1240cb353ac1ec61c3638c02b7dd5afe7ea48949f505f934e9f007' 
  AND token = '5hz8QdcZPULK67X6Lhcq8qucQzsnJHO9+LEDMqF8BW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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