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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7d86017d24314a95b741a27795ae8e76dded82fa396c61dd970c55bb6e5163' 
  AND token = 'YWG1T07pC45icXKB2wCna/a0Kom8wtAlCiFxY5CU+x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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