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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a232b480f15e6be241589645882e4efb789fc87252783fc4ec9b81c4c7e35127' 
  AND token = 'irwv31RRsTSRi97IkodBpzCZ6df0ziD7R4sEWiiJpe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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