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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd251c39e21db27c72a9ead24be5db58e492390b8a08cc75b29ee470c2b47bb68' 
  AND token = 'bLn07melMGXXx0tESI1jeKXpvptza/VAm6Eog+Nltxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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