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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89dc3f5b0d8e0334b2f9e318993e6c0afa9c7a6ee66f838ffdf2464122dd19b' 
  AND token = 'JNoSE5p6ZST82sayj7nQOhhP/Qgi9GYfL+3QJxjLUHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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