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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcce2b911b21b145aae23db5939cbbac3051472f092dff4fcf99bbb533180042' 
  AND token = 'olaFyh834D4N1EZsG8h1syY1Y6OJR5clvN0ozFRZR9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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