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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cea905016703772f4b3e5d026ab98617b60e4b650b7c0030be4f1853d7aec1d' 
  AND token = 'EuDSoI8GgZYUXegtxvEgbLeJ8I71DPgWb8m69ncMoxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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