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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495c3c9dd29579760c29e2b21769b2e7a25049b5332dea0fea98072a93a88f4b' 
  AND token = 'nGvlIGchjX6QSdIUaFGn6oA6Xl2BWY81vp0TpTxkDcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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