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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee49b41f859ba9b30b4220f616a9af53574a1ee71d536b79bfd9cdcec597577a' 
  AND token = 'LkGFkgjzCn2chRY2j/3oMMcIFD1S1lLDo7RAXdRZ1kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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