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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf604e1a29652146fdddbe8a38e30d32c295f12c492c26bd2f9854071ac10e3' 
  AND token = 'AldxbICWeEpxmWqyrB8gasHo8be6oiScXEgbey9ulVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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