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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b137da8c3094903c0248cddec2417ed1d65737d3420a9e6b3ac2159165349450' 
  AND token = 'qvgDZj2j3leJJH2RRlHUG2j8kSnvQhJ3hYf4AdNSxXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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