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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df9798a044f6e849ca0a8d33978f0bb025ab0f3be8b9662e290db35f05be3f0' 
  AND token = 'VkDfv92OUJ+xrS3a6uQtonPvCrsr+sq8cjwpiiUOGkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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