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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa10f0cd175279d27c8a7c7a5c0b58fb424dd149b4280dc1b49121e70fc2ca0' 
  AND token = 'he1CTTrvXJk2TFXxraNvFK167AutIDn8WZ5iPW/h/NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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