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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96883f8270198d783a43cc0c682f910eddc449f00dcea86d5622b95a9c1d7c7a' 
  AND token = 'IReRaEezhaT6xCCJkyCHfS4hlSFw2NEydT1aQNCIPGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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