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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3543782a27a1e860b05db6caf4c4e3d58ca80c9b1a23ff5e804c90760cbc28b1' 
  AND token = 'dcfc4gguMRO7UURIi54Bi+vtGaA9Tz/UnY6t7350NWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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