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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692ce3e241dccb7235795f615486bf8976cea8d8747d356ae6ec3fe483f0ee8a' 
  AND token = 'RGgmX2uh938ye25e/WH9btr1BJ3h0xqJzHBkXYmNyBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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