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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2417bf1914cf170a7201320395d06d07771cb77e31ad24cdd44a77161f70aae1' 
  AND token = '/MY5elkHD1UYRvG/gPyWtA71CKCWazGVFj4prv+vYYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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