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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01dfae7b78e75f5d5d56b6d13748ba83796a66d53e16760b2c246125f54efb2' 
  AND token = '9qa3nNBxgNqpmdBiyQfNdJ9lH11qVCVyDZw0CJykvxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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