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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06414c1d0498c83a9b0c05868563a6b0f036665bf5ddec7050a390efdc286a70' 
  AND token = 'c55aFm3ZChkLSPdU5gWK+Y4KTsqCmdDIrDD2RvHzC70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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