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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5daf0de52e4e100c848bc0e3c4912c5013dae10d5645d090aed8002115a2f176' 
  AND token = 'lZEBE7cr/o0XwvkzGPv+84O2AGFOdTQU7wMvraODYUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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