Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ddb486d3807d076d12628b4c715627c88297f77dfe2eb12c00f6aff9f53321' 
  AND token = 'xO7UBdAkyMGDH1mNvbW9VrrVnSNmgdBcSwXGsz7f0o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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