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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8481f90510f479d308f673189dd61c7d0fe482e0b3d2d678d0d5a4411987bd' 
  AND token = 'VWM9rtgDyypkpvpo04ta4nucHGnux70JlJ0F3vjl7qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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