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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267f02cdc453f6179fc4fdc7258e7c5519228fc0cc9f7c926c6bec45696e544a' 
  AND token = '5QAkP2miZ/4er+Jtol5gy951ZB6oepYKClrLpZL98Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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