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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ccc186cffc7f4951a1aa040d0e651158985b902ea23ce2938122ed1071fbbf' 
  AND token = 'e7Em1Sx8WoTAbNYa2WttnO/t9ZG9P9K7hykapiOtHVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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