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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2b137926cd9e6f842e2bd4b65ba97da6ea9a2ce27e7711a6ac0f12ad26284f' 
  AND token = 'OOav81inS8JrRBmuBpGeMuEeKWlekk7wXQtCmzBmZGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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