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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '104d73cb7fe888de7a31b46c1a3ffd46806d97ae3a4e56e69e2f2ee0708e3e17' 
  AND token = 'DPtuN6SHAel36K92o092OiAak1Oix2xmEpYixFwJjLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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