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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7749cd169167bdf5cfff8b85081806485c0839ab4ba6b5fcac252cdbc8e1f0d' 
  AND token = '4HSpes8kyi57hAr+ldRkug4NC5KypgOFq/eMMj+LD1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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