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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23653294248210ab2454a66cbad01da85a55acde52bcc3ca65dfed2c511292f' 
  AND token = '3Q5r+T+aRL8UGqqP9W7u0GUNke6S6NuFWruf5wSdhKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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