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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03cfdeca33cc2a62ab669b6f1a2d52850071b1f42876bf921b332842651b7966' 
  AND token = 'WgRg7bEyIpH74ay+448kDzopG76B4wf+UUQQjrtO4U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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