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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c56ae6a30571caea887e708910541e76d6fdfbee406d740a9754ffabb714675' 
  AND token = 'xcINZhY1YgF1KGYLm5AngwyE3UZVA+A1ICuM2f7VFkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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