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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624f5cd2a276647190c766ddf84f030fe544893aeb69ca334f18032387ea4899' 
  AND token = 'hKhcrfmsBf5nUFXar18n3x29jp+awvV/mnXUUOg8eIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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