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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70aaf6c453e29a98d8b02bde5e5d3f697e6720046fb58dbfb404c5cec44ec34d' 
  AND token = 'XusJ8ByE18W+EeghimyTpEJYkivVsaOYsgoduT7T+z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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