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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8070381b635752913e41bc0fe860fe297997c3dd8f9d636b8a1c72ae6b411662' 
  AND token = 'z6fJO/7hmgEfDczZkTN5P/NxyP04cYTv2qwcMOnXrb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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