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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7cfcf5ce214e520b777133b231705fb094050e9b34713852dd2b1804323a17' 
  AND token = 'kxvU6ReBX/IKG148A2YMgwQDuQxKbrkY5WjKRk4m5NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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