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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33582dac02666f3257c8b308eb33e96df23deb055ac4be5336f7e815490d77e' 
  AND token = 'hBUt8a7FBLurCdQcmfDNtTTiU/slNw4W1ZyV03hbMhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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