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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2aa52a50e73fe6e1152c16405ebed81b50ef55c2cefef6e7715399f6132c0f' 
  AND token = '670csjzPoySW5YJSrCDXH8mr3vGl0Pj6CuCU7UVbkgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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