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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e88e16a451c376962be29808fd2e50ad3fcfea27243608611aba0556fca8c4' 
  AND token = '2bTItK/UVu2ZqRwETBLu1QIBD0bwmY89CT2vn92wLCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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