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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2683e3fe7790cec016c4db43f638fba42199af0cd40a388fe432fa8c8d348b4' 
  AND token = '3TqJGQ8LR3wMjCRvXZ70YGu8rckrDWZDBV4c56iVOFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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