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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202126021a3dd6c3b5cb017c4c86babb7172fc713145e4e87fa876106de312ab' 
  AND token = '/VSYblU5BFTcuRRObnlzzGpCayh877rVdiQnwFNOcic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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