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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58bf32828663a65e359d838179a43ec0002575c01f1e6b1403de6728c9f3ec5' 
  AND token = '2nAr56iVhbvCBJurYIb0ikMUVsV4NG1bSZc7aO5xeto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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