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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ae9f9f463f9b8640ab1d2523e37531b56641ea9b5607de005da1ddbe2de080' 
  AND token = '/sKs50WwWCk0/29/ZODbGSXpZ0Jw++BiX4RnGqPP4MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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