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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5903bb0171165daa8b00bc1fc2d40119bf7f6261ac05d934389f287587e4dc6e' 
  AND token = 'kJyaFJzaCA4vx47NC5AykbNIKtRnl8PpOrtlgBj7t7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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