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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30b0e2bed56e8c3723ced0c463e2a364c5c3e6ea6a24754b78db2211ab8f8ec' 
  AND token = 'XqPsvGN7J3WWMGgvaXQnqP4Bl9MOubkjsLWDAaP0Fz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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