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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25d5def2b671c09b8e54ec80fd59f8df7967c525f17b4ef6dda69bb30c3775b1' 
  AND token = 'JYjBMOLMOel0ZKZeEjZir/9aX2rrvOPtltGySUzards=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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