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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07db86efd9f7f43d063a6839d2da7663080ef525d00ce83a551a1b064cc57873' 
  AND token = 'B5qNQrHpa0rua6u7YQ+A2CTSMyBAuXtwEJcavGx2fyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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