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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8263b3c6ccfaef5053f6abee67078803fb7da978a9925fc4a0ad9bc7d02350' 
  AND token = 'n9MbDNGJw2bt7zdoKm0p8iqdJVtZn53ax9Wq8yZbowY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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