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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5020df04d830176a52ce6a383db3fafb545bf9275a6dde8ea2a8e98b0ea299' 
  AND token = 'wB+vAyS6xSSZoITjFslk2rRHVTvw76q/4TXb0j33LY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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