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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a08467cd17e564f64e943b3343a119a631ef9f58297b1e9b7129bc14354fdad' 
  AND token = '1lxATdsowNdec/uFiT8HMLxzsKA6MG97LcIfnbc/Hwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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