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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee62c859633ba2b1301e7c2a110967f859c10f476d7b0138ba1503f3274e6bcc' 
  AND token = '62k05kQy5eKkhFCCMc2umZQFfBsLBHE07Uyty9bWD+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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