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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a30e7f4cf3b151baf34b739cc9e6445a84073bf3ab141acfc76f856056fbbf5' 
  AND token = 'pv9eOOg12P1WT6xFt6JI+HJQ9BDei6lBZkAaRS1rPeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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