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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c939ba8c541bc33958ffe9d22ec42de8f684ebf39c97d9021dd0da607788523e' 
  AND token = 'CCaWmq6z3EwvkLLXyvPLWmx1aWTV4D4sbeGn7WqWivI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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