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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3b1d2d3314eacf7d6f893f63d6310f3398b144443acc880eeaf520941f853c' 
  AND token = 'Tf7CS8hVptZPcrBkiQb9vUmHp/e0FEQpQMkEqgdDX84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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